A Chevy Suburban is a steel truck-frame to which you can bolt a very big motor and a normal-looking passenger box. The box can contain people or it can contain other interesting-and-useful payloads. Like: A Dillon M134D Gatling Gun under a pop-up roof panel. The feds have several. read more
P.S. I currently own a black Suburban. Guess I like it that they look like a (lost) part of a Presidential motorcade. read more
The reason for so many vehicles in a presidential motorcade are many. One, of course is confusion of any attacker. Then you have two vehicles minimum of secret service agents, one of support staff for the president, and one of communication equipment. In some cases there may be a back up for communication gear, and another staff car. read more